What is CVE-2026-103319?

CVE-2026-103319 is a medium-severity vulnerability in Opay Payment Gateway For Woocommerce, classified under Improper Authentication. CVSS score: 5.3/10. Published 2026-10-26.

How severe is CVE-2026-103319?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Auth bypass in Opay Payment Gateway For Woocommerce

CVE-2026-103319

The OPay Payment Gateway for WooCommerce WordPress plugin through 2.5.5 does not properly verify that payment notifications originate from the payment provider, as the secret used to validate their signature is empty by default, allowing unauthenticated attackers to forge a valid notification and mark arbitrary orders as paid, cancelled or failed.

Vulnerability class: Broken Authentication

Published 2026-10-26 · last modified 2026-10-26.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Opay Payment Gateway For Woocommerce

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

wpscan.com/vulnerability/c07f15a0-3c15-429f-bcde-1511ad658c6c/ (technical-description, exploit, vdb-entry)

Frequently asked questions

What is CVE-2026-103319?: CVE-2026-103319 is a medium-severity vulnerability in Opay Payment Gateway For Woocommerce, classified under Improper Authentication. CVSS score: 5.3/10. Published 2026-10-26.
How severe is CVE-2026-103319?: Medium severity. CVSS v3 base score is 5.3 out of 10.